System.UnauthorizedAccessException: Access to the path is denied when using System.OI.FileStream

During a recent deployment to production environment we started to get System.UnauthorizedAccessException on places we hade not seen it before. After some debugging a pattern appeared. The problem is that if you don’t use the FileStream constructor with FileAccess parameter you will get FileAccess.ReadWrite selected by default. So in our cases the User account running our service did only have read access to the file with is correct since we are only expecting to read from the file.

using (FileStream fs = new FileStream(filePath, FileMode.Open))
{}

Make sure, you ask for what you really need. If your application needs only Read access to a file, make sure to specify that in your FileStream constructor.

using (FileStream fs = new FileStream(filePath, FileMode.Open, FileAccess.Read))
{}

HowTo add new key to appsettings with WIX

When adding a new key for appsettings you need to split the action in 3 steps.
1. Create the new empty “add” element
2. Create and set the “key” attribute. The tricky part here is how to add the “key” to new created “add” element from step one. One way is to assume that the new created “add” element is the only element without a “key” attribute
3. Create and set the “value” attribute.

<util:XmlFile 
  Id='conf1' 
  Action="createElement" 
  ElementPath="//configuration/appSettings" 
  Name="add" 
  File="[INSTALLDIR]Web.config" 
  Sequence="1" />
<util:XmlFile 
  Id='conf2' 
  Action="setValue" 
  ElementPath="//configuration/appSettings/add[\[]not(@key)[\]]"
  Name="key" 
  Value="NewConfig" 
  File="[INSTALLDIR]Web.config" 
  Sequence="2" />
<util:XmlFile 
  Id='conf3' 
  Action="setValue" 
  ElementPath="//configuration/appSettings/add[\[]@key='NewConfig'[\]]"
  Name="value" 
  Value="the new value" 
  File="[INSTALLDIR]Web.config"
  Sequence="3" />

HowTo to set appsettings during installation using WIX

The point where most people have a hard time is remembering is to escape brackets. This to ensure WIX will not think it a property. If you forget to-do this you may end up in a situation where “config2″ value will bet set on “config1″ instead. See a correct example bellow

[ should be [\[]
] =should be [\]]

<Component Id='UpdateConfig' Guid='A89D47AF-7DBE-4a8d-9848-F35C78FD95ED' DiskId='1' KeyPath="yes">
  <util:XmlFile Id='config1' 
                Action="setValue" 
                ElementPath="//configuration/appSettings/add[\[]@key='FirstKey'[\]]/@value"
                File="[INSTALLDIR]Web.config" 
                Value="[NEWVALUE1]" />
  <util:XmlFile Id='config2' 
                Action="setValue" 
                ElementPath="//configuration/appSettings/add[\[@key='SecondKey'[\]]/@value"
                File="[INSTALLDIR]Web.config" 
                Value="[NEWVALUE2]" />
</Component>

And the example web.config

<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="FirstKey" value="oldvalue"/>
    <add key="SecondKey" value="oldvalue"/>
  </appSettings>
</configuration>

HowTo update appsettings programmatically

Recently I was writing functional test for an application that read settings from the appsettings element in App.Config. The problem was that the application under test was expecting to react different based on the settings so need a way to alter the values between tests. I ended up writing bellow code for it

private static void SetAppSettings(string key, string value)
{
   Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
   config.AppSettings.Settings[key].Value = value;
   config.Save(ConfigurationSaveMode.Modified);
   ConfigurationManager.RefreshSection("appSettings");
}

Scrumy on Softpedia

Today I happen to find out that Scrumy have been added to Softpedia’s library of software. It’s nice to see that people are interested in my project and that they have even rated it with 5 stars.

http://www.softpedia.com/get/Programming/Components-Libraries/Scrumy.shtml

Share source files between Visual Studio projects

After some time developing software you naturally start to repeat yourself and solve the same problem over and over again. If you could simple share this implementations between all your solution’s, you would save a lot of time. On common way to share source code between different project is to create separate tool/”good to have code” assembly and simply include this project or assembly into every solution. Many times I find this very heavy weighted and overkill. But the big problem according to me is that you have expanded the attack surface of your application, by adding public API’s that you are not using but can be used by hackers. So the other solution is to simple add the part you actual need to your solution. By adding the source file as linked resources, will enable you to share it between many projects and still maintain only one copy of the file.

Another good example of usage is if you for example are creating an application for both windows phone 7 and windows. In this case you need two separate projects for every class library.

In Visual Studio, choose ‘Add As link’ when adding an existing item.
AddAsLink in Visual Studio

Get all iteration paths in TFS programtically

A common way to organize work items in TFS is to assign them to different iterations. I’m using this with the scum model where every sprint corresponds to one iteration. So how can we get all iteration paths in TFS to use them in our own implementation. The information is not saved on the work items, we will need to look directly at the project object and recursively iterate on the iteration object tree to get all iteration paths.

Example project
TFSIterationPath
In this example you will be able to connect to a TFS server and get all work items based on project and iteration path listed.
Read more

Free options for Reflector (.NET decompiler)

After Reflector did change their licensing so it was no longer free to use I did stick around for a long time on an old version of Reflector. The time have now come to find an replacement for Reflector. After some searching I found 4 good candidates.

JustDecompile
http://www.telerik.com/products/decompiling.aspx
Feature
• Fast code navigation
• Create visual studio projects
• Extract resources from assemblies
• Easy assembly management
• Visual studio inline decompilation
• Command line support
• Integrate with Windows Explorer Context Menu
• Silverlight XAP decompilation from URL
Read more

Scrumy Beta v1.0.7 is released

The big change in this release is an improved UI for changing the layout of the printed items.
Scrumy_Settings

The release can be download here: http://scrumy.codeplex.com/releases/view/100750

Message box that can center on parent form

When using the built in MessageBox class to show message you are not able to center the dialog based on the parent form. This leads to that the dialog normaly popup in the center of the screen even if the application it’s executed only cover the upper right corner for example. The solution is simple to create our own MessageBox clone with this added functionality. I was also missing a possibility to show a self closing message. So I could for example give the user 10 seconds to respond to the message, after that I would simple close the message dialog and use the default response.


Read more

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